Citation: YU Jun, MAO Dong-Sen, GUO Qiang-Sheng, HAN Lu-Peng, LU Guan-Zhong. Effect of Calcination Temperature of Monodispersed SiO₂ on the Performance of Rh-Based Catalysts for CO Hydrogenation[J]. Acta Physico-Chimica Sinica, ;2012, 28(03): 667-673. doi: 10.3866/PKU.WHXB201112221 shu

Effect of Calcination Temperature of Monodispersed SiO₂ on the Performance of Rh-Based Catalysts for CO Hydrogenation

1.
1. Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, P. R. China;
2. Research Institute of Applied Catalysis, Shanghai Institute of Technology, Shanghai 201418, P. R. China

Received Date: 11 October 2011
Available Online: 22 December 2011
Fund Project: 上海市科委(08520513600) (08520513600) 上海市教委重点学科建设(J51503) (J51503)上海市优秀青年教师专项基金(yyy10083)资助项目 (yyy10083)

Based on a comparison of catalytic performances of Rh-Mn-Li/SiO₂ catalysts, in which commercial SiO₂ and monodispersed SiO₂ synthesized by the Stöber method were used as the support, respectively, the effect of the calcination temperature of the synthesized SiO₂ on the catalytic performance of Rh-Mn-Li/SiO₂ for CO hydrogenation to C₂ oxygenates was investigated. Fourier transform infrared spectroscopy, N₂ adsorption-desorption, temperature-programmed reduction with hydrogen (H₂-TPR), and temperature-programmed surface reaction (TPSR) were used to characterize the physico-chemical properties of the SiO₂ supports and the corresponding catalysts. The results showed that the number of surface Si―OH groups on the SiO₂ supports affected the dispersion of metal and the interaction between Rh and Mn. Large amount of surface Si―OH groups was favorable for the dispersion of Rh particles and CO adsorption, and enhanced the activity of the catalyst. An appropriate amount of Si ―OH groups can gain moderate interaction between the Rh and Mn. This interaction is conducive to achieve the right CO dissociation ability, which is favorable for the insertion of CO to CH_x, and ultimately increases the selectivity of C₂ oxygenates.
- Rh-Mn-Li/SiO₂,
- CO hydrogenation,
- C₂ oxygenate,
- Calcination temperature
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沈阳化工大学材料科学与工程学院沈阳 110142

Effect of Calcination Temperature of Monodispersed SiO2 on the Performance of Rh-Based Catalysts for CO Hydrogenation

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通讯作者: 陈斌, bchen63@163.com

Effect of Calcination Temperature of Monodispersed SiO₂ on the Performance of Rh-Based Catalysts for CO Hydrogenation